Malicious PDF — malware analysis report

Static analysis result for SHA-256 1229ab62ec6609f1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 18:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b44da9e6f5e28eaed6a0014c1a770d3d SHA-1: 86b6165513b81f0f76dd53904bd607d219f16c63 SHA-256: 1229ab62ec6609f12207cad62438b2f48e98bdcf921d164c848f75d4d1a14e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf443d26f2---30147146294.pdf In PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/xidugofokanafafun.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/53537258501.pdfIn PDF document text
    • https://thehouseproduction.net/file/demetufasapumaluzedabamo.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/14002492361.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/mutovadojijebu.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/befejejuloxogi.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/19204048737.pdfIn PDF document text
    • https://alohasafaris.com/files/83175649598.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/68382445941.pdfIn PDF document text
    • http://perksys.com/userfiles/file/robonozobelemabevegafop.pdfIn PDF document text
    • http://unseretochter.ch/images/file/43325957799.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35a40ac4b---43906219823.pdfIn PDF document text
    • http://rld-carbon.ru/file/gifex.pdfIn PDF document text
    • https://fratellifurloni.it/file/bajozorusar.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379eb66024a---wawavodimezixuja.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/digilifafufugibipa.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/vekakamakotixe.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zazozijitabutaworaxuxili.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/68710365880.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/jebipig.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/26484941373.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/liwunopos.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/88860826339.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/243bd5f241280061e9f26b3c023d14c4/pumalevosemufeforu.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/59627091210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=star7+live+tv+2.9+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10492 bytes
SHA-256: b244a473395d08a7a18cf82bf62dd7ad2fbea6a39e61edd7e3db93d929885bed
font_02_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 17704 bytes
SHA-256: 5902dcdd256b4e2bf69dd087240df018fd8f7816778a6d3825e6c98c2540e6d7

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